I'm trying to send a Token gift to a friend but their name isn't on my list of Friends. Why?

When sending a Token gift, a friend will not appear on your list of friends if they've already received the maximum amount of gifts or they've already received and accepted a gift from you on that day. Players may receive up to 5 Token gifts per day (1 gift from 5 different friends), totaling 12,500 Tokens per day.